Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Labyrinth seal
Patent
1991-03-11
1993-03-02
Kwon, John T.
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Labyrinth seal
4151721, 277 53, 277 70, 277 75, F01D 1102
Patent
active
051904403
ABSTRACT:
A labyrinth seal which reduces the inlet swirl and circumferential flow of fluid within the sealing cavity of a rotating shaft system in order to eliminate the destabilizing influence of the labyrinth seal, has a plurality of primary flow bypass passageways which extend from the high pressure face of the seal to the space between a first set and a second set of labyrinth teeth. The plurality of primary flow bypass passageways are equally spaced around the circumference of the seal and are preferably inclined such that the fluid is introduced into the seal cavity at a desired orientation. Each of the primary flow bypass passageways can be a passageway which is inclined at an acute angle to the shaft axis or a combination of an axial passageway and a radial passageway. The primary flow bypass passageways can be in the form of a plurality of generally radial passageways which intersect a common annular opening in the high pressure face of the seal. Also, multiple sets of secondary flow bypass passageways can be positioned at predetermined locations downstream from the first set of passages to function in a similar manner. Annular grooves can be provided in the outer surface of the seal to connect each adjacent set of secondary flow bypass passageways which straddle a set of labyrinth teeth.
REFERENCES:
patent: 1966855 (1934-07-01), Gregg
patent: 2846245 (1958-08-01), Weavier
patent: 2925290 (1960-02-01), Greenwald
patent: 2990202 (1961-06-01), Dennison
patent: 3093382 (1963-06-01), Macks
patent: 3532399 (1970-10-01), Gray
patent: 3752607 (1973-08-01), Bilobran
patent: 3759532 (1973-09-01), Lindeboom
patent: 3804424 (1974-04-01), Gardner
patent: 3905605 (1975-09-01), Hubner
patent: 3976395 (1976-08-01), Kalnin et al.
patent: 4132416 (1979-01-01), Adams
patent: 4386780 (1983-06-01), Dernedde
patent: 4396302 (1983-08-01), Drevet et al.
patent: 4513975 (1985-04-01), Hauser et al.
patent: 4516921 (1985-05-01), Kemp
patent: 4541773 (1985-09-01), Drevet et al.
patent: 4976444 (1990-12-01), Richards
NASA Publication 2133 Entitled Flow Induced Spring Coefficients of Labyrinth Seals for Application in Rotor Dynamics, H. Benckert et al., pp. 189-212.
Publication of Solar Turbines Incorporated Entitled An Examination of Gas Copmpressor Stability and Rotating Stall, FoZi, pp. 1-15.
Publication from International Conference on Rotor Dynamics, Sep. 86, Entitled Theoretical and Experimental Study on the Destabilizing force by Labyrinth Seal, K. Hiroshi et al., pp. 603-608.
Publication of Asme Conference, Sep. 85, Entitled Evaluation of Aerodynamic Instability Mechanisms for Centrifugal Compressors, Kirk, pp. 1-11.
Maier Martin D.
Osborne Colin
Dresser-Rand Company
Kwon John T.
LandOfFree
Swirl control labyrinth seal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Swirl control labyrinth seal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Swirl control labyrinth seal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-123437